TWI484219B - Head mounted display device - Google Patents

Description

Head mounted display device

The present invention relates to a display device, and more particularly to a head mounted display device.

The head-mounted image display device is usually in the form of glasses, an eye mask or a helmet, and the display screen is placed close to the user's eyes, and the focal length is adjusted by the light path to project a picture to the eyes at a close distance. With the rapid development of technology, the head-mounted image display device can be expanded to the fields of driving, medical treatment and the like in addition to the use of leisure and entertainment. Patients with amblyopia and those wearing artificial retinas can view external images by wearing such an image display device.

Current head mounted display devices use larger optical elements in order to eliminate aberrations at large viewing angles. However, under such a design, the size and weight of the head mounted display are liable to cause discomfort to the user. In addition, the existing head-mounted display devices generally shield the user's line of sight, thereby causing inconvenience in use, and also limiting the application range of the head-mounted display device.

The present invention provides a head-mounted display device which can improve the discomfort and inconvenience in use.

A head mounted display device of the present invention includes a first light guide plate, a first micro display, a first mirror, a first lens group, and a plurality of first microstructures. The first light guide plate has a first face and a second face opposite the first face. The first microdisplay faces the first side and is disposed at the first end of the first light guide. The first mirror is disposed in the first light guide plate and located at the first end. The first mirror has a first reflective surface, and the first reflective surface faces the second end of the first light guide plate relative to the first end and is at an angle to the first surface. The first lens group is disposed between the first light guide plate and the first micro display. The first microstructure is disposed on the first side.

In an embodiment of the invention, the first microdisplay is a visible light microdisplay.

In an embodiment of the invention, the angle between the first reflective surface and the first surface is α, the thickness of the first light guide plate is T, and the length of the first light guide plate is L, wherein

In an embodiment of the invention, the first light guide plate further has a third surface and a fourth surface connected between the first surface and the second surface, and each of the first microstructures is perpendicular to the first surface and The shape perpendicular to the plane of the third surface is a quadrilateral, and the quadrilateral includes a first side, a second side, a third side, and a fourth side, the first side and the third side are opposite to each other, and the second side and the fourth side are opposite to each other. Opposite each other and connected to the first side and the first Between the three sides, wherein the first side is joined to the first side.

In an embodiment of the invention, the lengths of the first side, the second side, and the third side are respectively X, and the length of the fourth side is 2X, wherein 10 μm≦X≦500 μm.

In an embodiment of the invention, the angle between the third side and the fourth side is 90°-α, and the angle between the first side and the fourth side is 90°+α.

In an embodiment of the invention, the angle between the first side and the second side and the angle between the second side and the third side are 90 degrees.

In an embodiment of the invention, the angle between the first side and the second side is 90°+α, and the angle between the second side and the third side is 90°-α.

In an embodiment of the invention, the above α is 30°.

In an embodiment of the invention, the refractive index of the first microstructure is equal to the refractive index of the first light guide plate.

In an embodiment of the present invention, the head mounted display device further includes a fixing device configured to set the first light guide plate, the first micro display, the first mirror, the first lens group, and the first microstructure adjacent to each other The user's first look.

In an embodiment of the invention, the head mounted display device further includes a second micro display, a second mirror, and a second lens group. The second microdisplay faces the first side and is disposed at the second end, wherein the second end is opposite the first end. The second mirror is disposed in the first light guide plate and located at the second end. The second mirror has a second reflecting surface, and the second reflecting surface faces the first end and is at an angle to the first surface. The second lens group is disposed between the first light guide plate and the second micro display.

In an embodiment of the invention, one of the first microdisplay and the second microdisplay is a visible light microdisplay, and the other is an infrared microdisplay.

In an embodiment of the invention, the head mounted display device further includes a second light guide plate, a second micro display, a second mirror, a second lens group, and a plurality of second microstructures. The second light guide plate has a fifth surface and a sixth surface opposite to the fifth surface. The second micro display faces the fifth side and is disposed at a third end of the second light guide plate. The second mirror is disposed in the second light guide plate and located at the third end. The second mirror has a second reflecting surface, and the second reflecting surface faces the fourth end of the second light guiding plate with respect to the third end, and is at an angle with the fifth surface. The second lens group is disposed between the second light guide plate and the second micro display. The second microstructure is disposed on the fifth side.

In an embodiment of the present invention, the head mounted display device further includes a fixing device configured to set the first light guide plate, the first micro display, the first mirror, the first lens group, and the first microstructure adjacent to each other The first eye of the user, and the second light guide plate, the second micro display, the second mirror, the second lens group and the second microstructure are disposed adjacent to the second eye of the user.

In an embodiment of the invention, the first microdisplay and the second microdisplay are visible light microdisplays, and the image beam output by the first microdisplay and the image beam output by the second microdisplay have parallax.

Based on the above, the head-mounted display device of the present invention introduces an image beam emitted by the micro-display into the light guide plate through the lens group, transmits the light beam in the light guide plate in a total reflection manner, and destroys the total reflection through the microstructure. Beam from the first Shot on one side and passed it on to the human eye. Since the image beam is transmitted in the light guide plate in a total reflection manner, aberration is less likely to occur. Therefore, the head-mounted display device of the present invention can eliminate the use of a large-sized optical component, thereby improving the volume and weight of the head-mounted display to the user. In addition, since the light guide plate has a high light transmittance, the user can also see the external image while watching the image light beam emitted by the micro display. Therefore, the head-mounted display device of the present invention can improve the problem of being shielded from the user's line of sight, thereby improving the inconvenience in use.

The above described features and advantages of the invention will be apparent from the following description.

100, 200, 300‧‧‧ head-mounted display devices

110‧‧‧First light guide

120‧‧‧First microdisplay

130‧‧‧First mirror

140‧‧‧First lens group

150, 150A‧‧‧ first microstructure

160‧‧‧Fixed devices

210‧‧‧Second light guide

220‧‧‧Second microdisplay

230‧‧‧second mirror

240‧‧‧second lens group

250‧‧‧Second microstructure

410‧‧‧Retina wafer

420‧‧‧Solar cell

A‧‧‧Distribution area

B, B1‧‧‧ image beam

D1‧‧‧ extending direction

D2‧‧‧ thickness direction

E1‧‧‧ first eye

F1‧‧‧ first side

F2‧‧‧ second side

F3‧‧‧ third side

F4‧‧‧ fourth side

L, X‧‧‧ length

P1‧‧‧ first end

P2‧‧‧ second end

P3‧‧‧ third end

P4‧‧‧ fourth end

R1‧‧‧ first reflecting surface

R2‧‧‧ second reflecting surface

S1‧‧‧ first side

S2‧‧‧ second side

S3‧‧‧ third side

S4‧‧‧ fourth side

S5‧‧‧ fifth side

S6‧‧‧ sixth side

T‧‧‧ thickness

α, β, θ1, θ2, θ3, θ4‧‧‧ angle

1 is a top plan view of a head mounted display device in accordance with a first embodiment of the present invention.

Figure 2 is an enlarged schematic view of the first microstructure of Figure 1.

3 is a side elevational view of a head mounted display device in accordance with a first embodiment of the present invention.

4 is a top plan view of a head mounted display device in accordance with a second embodiment of the present invention.

Figure 5 is an enlarged schematic view of the first microstructure of Figure 4.

Figure 6 is a top plan view of a head mounted display device in accordance with a third embodiment of the present invention.

1 is a top plan view of a head mounted display device in accordance with a first embodiment of the present invention, FIG. 2 is an enlarged schematic view of the first microstructure of FIG. 1, and FIG. 3 is a first embodiment of the present invention. A side view of a head mounted display device. Referring to FIG. 1 , the head mounted display device 100 of the present embodiment includes a first light guide plate 110 , a first micro display 120 , a first mirror 130 , a first lens group 140 , and a plurality of first microstructures 150 .

The first light guide plate 110 is, for example, a rectangular parallelepiped having a first surface S1, a second surface S2 opposite to the first surface S1, and a third surface S3 and a fourth surface connected between the first surface S1 and the second surface S2. S4, wherein the third surface S3 is opposite to the fourth surface S4. In addition, the first light guide plate 110 has an extending direction D1 and a thickness direction D2, the thickness direction D2 is perpendicular to the extending direction D1, and the first surface S1 and the second surface S2 are parallel to the extending direction D1, and the third surface S3 and the fourth surface are S4 is parallel to the thickness direction D2. In addition, the material of the first light guide plate 110 may be a material having a refractive index greater than 1 such as resin, glass, polycarbonate (PM) or acrylic (PMMA), so that the light beam can be transmitted to the first guide in a total reflection manner. Inside the light panel 110.

The first microdisplay 120 is disposed at an end of the first light guide plate 110 and is adapted to emit an image light beam B toward the first light guide plate 110. In detail, the first microdisplay 120 is, for example, facing the first surface S1 and disposed at the first end P1 of the first light guide plate 110, wherein the first end P1 is, for example, but not limited to, adjacent to the fourth surface S4 and away from The third side S3. The first microdisplay 120 can be a visible light micro display or an infrared light micro display depending on the use of the head mounted display device 100, wherein the visible light micro The display can be a miniature organic light emitting display (OLED), a liquid crystal on silicon display (LCOS Display) or other microdisplay capable of providing visible light.

The first mirror 130 is disposed in the first light guide plate 110 and disposed corresponding to the first micro display 120. In the present embodiment, the first mirror 130 is disposed at the first end P1, for example, corresponding to the first microdisplay 120. In addition, the first reflecting mirror 130 has a first reflecting surface R1, wherein the first reflecting surface R1 faces the second end P2 of the first light guiding plate 110 with respect to the first end P1, and is at an angle α with the first surface, so that The image beam B reflected by the first reflecting surface R1 can be transmitted to the first light guiding plate 110 in a total reflection manner.

The first lens group 140 is disposed between the first light guide plate 110 and the first micro display 120 such that the image light beam B emitted by the first micro display 120 is collimated into the first light guide plate 110. Therefore, the first lens group 140 preferably bears against the first surface S1 of the first light guide plate 110 to have a better convergence effect. This embodiment does not particularly limit the composition of the first lens group 140. For example, the first lens group 140 may be composed of a plurality of lenses, and the lenses may be selected from a spherical lens, an aspheric lens, a cemented lens, or a combination thereof.

The first microstructure 150 is disposed on the first surface S1 for destroying total reflection to derive the image beam B from the first surface S1 and to be transmitted to the first eye E1 of the user. Therefore, in order for the first microstructure 150 to effectively introduce the image beam B into the first eye E1 of the user, and avoiding deflecting the image beam B from the first lens group 140, The method is transferred to the first light guide plate 110, and the first microstructures 150 are disposed in a region other than the first lens group 140, and preferably corresponds to the pupil arrangement of the first eye E1. In general, the diameter of the pupil falls within the range of 2 mm to 8 mm, so the length of the distribution area A of the first microstructure 150 should also be 8 mm or more.

It should be noted that the present embodiment does not limit the number of the first microstructures 150 in the distribution area A and their distribution patterns. For example, the first microstructures 150 may be arrayed or randomly distributed within the distribution area A. However, regardless of the distribution type, the first microstructures 150 are preferably densely distributed in the distribution area A to concentrate the image beam B emitted from the first light guide plate 110. In addition, the size of the first microstructures 150 is preferably below 500 μm to reduce the visibility of the human eye to the first microstructures 150.

Referring to FIG. 1 and FIG. 2, the shape of each first microstructure 150 perpendicular to the first surface S1 and perpendicular to the plane of the third surface S3 (ie, the plane formed by the extending direction D1 and the thickness direction D2) is, for example, a quadrangle, and the quadrilateral includes a first side F1, a second side F2, a third side F3, and a fourth side F4, the first side F1 and the third side F3 are opposite to each other, and the second side F2 and the fourth side F4 are opposite to each other Connected between the first side F1 and the third side F3, respectively, wherein the third side F3 is relatively adjacent to the first lens group 140, and the first side F1 is engaged with the first side S1. The bonding may be performed by bonding the first side F1 to the first side S1 with an optical glue. Alternatively, the first microstructures 150 and the first light guide plate 110 may be integrally formed by means of a stamper.

In this embodiment, the angle θ1 between the first side F1 and the second side F2 and the angle θ2 between the second side F2 and the third side F3 are, for example, but not limited to, 90°, and the third side F3 The angle θ3 sandwiched by the fourth side F4 and the angle θ4 of the fourth side F4 and the first side F1 are determined by the angle α between the first reflecting surface R1 and the first surface S1. Specifically, if the image beam B emitted from the first light guide plate 110 is to be positively incident on the first eye E1, the refractive index of the first microstructure 150 is the same as the refractive index of the first light guide plate 110, and the calculation is performed. The obtainable angle θ3 is 90°-α, and θ4 is 90°+α. For example, when α is 30°, θ3 is 60° and θ4 is 120°. However, the present invention is not limited to the above, and in another embodiment, the angle θ1 may be made equal to the angle θ3, and the angle θ2 may be equal to the angle θ4, that is, θ1 = θ3 = 90° - α, θ2 = θ4 = 90 °+α. In addition, the thickness T of the first light guide plate 110 in the thickness direction D2 and the length L of the first light guide plate 110 in the extending direction D1 also depend on the angle α between the first reflecting surface R1 and the first surface S1. Specifically, the length L and the thickness T satisfy the relationship:

In this embodiment, the material of the first microstructure 150 is the same material as that of the first light guide plate 110. Therefore, the image beam B can be transmitted in a reflective manner during transmission to the first light guide plate 110 and from the first light guide plate 110 to the first eye E1 of the user, thereby reducing the problem of aberration. Therefore, the head-mounted display device 100 of the present embodiment can eliminate the use of a large-sized optical component, thereby improving the size and weight of the conventional head-mounted display. In addition, since the first light guide plate 110 has a high light transmittance, the user can also see the external image while viewing the image light beam B emitted by the first micro display 120. Therefore, the head mounted display device 100 of the present embodiment can improve the cover The problem of the user's line of sight is masked, thereby improving the inconvenience in use.

Referring to FIG. 3, the head mounted display device 100 of the present embodiment may further include a fixing device 160 for the first light guide plate 110, the first micro display 120, the first mirror 130, the first lens group 140, and the first The microstructure 150 is disposed adjacent to the first eye E1 of the user, for example, disposed in front of the first eye E1. The fixture 160 can be eyeglasses, eye shields, helmets, or any item suitable for securing the above-described members to the head and adapted to be removed from the head for greater flexibility and convenience.

4 is a top plan view of a head mounted display device in accordance with a second embodiment of the present invention, and FIG. 5 is an enlarged schematic view of the first microstructure of FIG. 4, wherein FIG. 4 omits the fixing device. Referring to FIG. 4 and FIG. 5, the head-mounted display device 200 of the present embodiment is substantially the same as the head-mounted display device 100 of FIG. 1, and the same components are denoted by the same reference numerals and will not be described again. The difference from the head mounted display device 100 is that the head mounted display device 200 further includes a second micro display 220, a second mirror 230, and a second lens group 240. The second microdisplay 220 faces the first surface S1 and is disposed at the second end P2 of the first light guide plate 110. The second mirror 230 is disposed in the first light guide plate 110 and located at the second end P2. The second mirror 230 has a second reflecting surface R2, and the second reflecting surface R2 faces the first end P1 and is at an angle β with the first surface S1. The second lens group 240 is disposed between the first light guide plate 110 and the second micro display 220.

In this embodiment, the second microdisplay 220, the second mirror 230, and the second lens group 240 are disposed symmetrically with the first microdisplay 120, the first mirror 130, and the first lens group 140, for example, in the first guide. The opposite two of the light board 110 end. Moreover, in order to simplify the structural design of each of the first microstructures 150A, the angle β between the second reflecting surface R2 and the first surface S1 may be equal to the angle α between the first reflecting surface R1 and the first surface S1. In this way, the shape of each of the first microstructures 150A perpendicular to the first surface S1 and perpendicular to the plane of the third surface S3 is, for example, an isosceles trapezoid, and θ1=θ3=90°-α=90°-β. , θ2 = θ4 = 90 ° + α = 90 ° + β. Further, the length X of the first side F1, the second side F2, and the third side F3 is, for example, half the length of the fourth side, wherein 10 μm ≦X ≦ 500 μm.

In some blind patients, by projecting a visible light source into the patient's eye implanted with the retinal wafer 410, the current irritates the optic nerve, allowing the blind patient to see the external image. In general, the retinal wafer 410 needs to be electrically connected to the solar cell sheet 420 to charge the retinal wafer 410. In other words, at least one visible light microdisplay and one infrared microdisplay are required for the blind patient to see the external image. In this embodiment, one of the first microdisplay 120 and the second microdisplay 220 may be a visible light microdisplay, and the other may be an infrared microdisplay. In this way, by stimulating the retinal wafer by an image beam (not shown) emitted by the visible light microdisplay and charging the solar cell 420 by the infrared beam B1 emitted by the infrared microdisplay, the blind patient can be seen in the visible light micro The image beam emitted by the display.

Figure 6 is a top plan view of a head mounted display device in accordance with a third embodiment of the present invention. Referring to FIG. 6, the head-mounted display device 300 of the present embodiment is substantially the same as the head-mounted display device 200 of FIG. 2, and the same components are denoted by the same reference numerals and will not be described again. The difference from the head mounted display device 200 is that the head The wearable display device 300 further includes a second light guide plate 210 and a plurality of second microstructures 250. Further, the second light guide plate 210 has a fifth surface S5 and a sixth surface S6 opposite to the fifth surface S5. The second microdisplay 220 faces the fifth surface S5 and is disposed at the third end P3 of the second light guide plate 210. The second mirror 230 is disposed in the second light guide plate 210 and located at the third end P3. The second mirror 230 has a second reflecting surface R2, and the second reflecting surface R2 faces the fourth end P4 of the second light guiding plate 210 with respect to the third end P3, and is at an angle β with the fifth surface S5, wherein the angle β The design of the device can be referred to FIG. 5 and its corresponding description, and will not be described again. The second lens group 240 is disposed between the second light guide plate 210 and the second micro display 220. The second microstructure 250 is disposed on the fifth surface S5. The structural design of the second microstructure 250 can be referred to FIG. 2 and its corresponding description, and details are not described herein.

In this embodiment, the head mounted display device 300 may further include a fixing device 160 as shown in FIG. 3 to the first light guide plate 110, the first micro display 120, the first mirror 130, and the first lens group. The first microstructures 150 are disposed adjacent to the first eye E1 of the user, for example, in front of the first eye E1 of the user. The second light guide plate 210, the second micro display 220, the second mirror 230, the second lens group 240, and the second microstructure 250 are disposed adjacent to the second eye E2 of the user, for example, provided to the user. The front of the second eye E2.

In addition, the first microdisplay 120 and the second micro display 220 are, for example, visible light microdisplays. Moreover, by having the image beam B outputted by the first microdisplay 120 and the image beam B1 output by the second microdisplay 220 have parallax, the user wearing the head mounted display device 300 can see the stereoscopic image. Like (for example, watching a 3D movie by wearing a head mounted display device 300).

In summary, the head-mounted display device of the present invention introduces an image beam emitted by the micro-display into the light guide plate through the lens group, transmits the light beam in the light guide plate in a total reflection manner, and destroys the total reflection through the microstructure. The image beam is emitted from the first side and transmitted to the human eye. Since the image beam is transmitted in the light guide plate in a total reflection manner, aberration is less likely to occur. Therefore, the head-mounted display device of the present invention can eliminate the use of a large-sized optical component, thereby improving the volume and weight of the head-mounted display to the user. In addition, since the light guide plate has a high light transmittance, the user can also see the external image while watching the image light beam emitted by the micro display. Therefore, the head-mounted display device of the present invention can improve the problem of being shielded from the user's line of sight, thereby improving the inconvenience in use.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ head-mounted display device

110‧‧‧First light guide

120‧‧‧First microdisplay

130‧‧‧First mirror

140‧‧‧First lens group

150‧‧‧First microstructure

A‧‧‧Distribution area

B‧‧·Image beam

D1‧‧‧ extending direction

D2‧‧‧ thickness direction

E1‧‧‧ first eye

L‧‧‧ length

P1‧‧‧ first end

P2‧‧‧ second end

R1‧‧‧ first reflecting surface

S1‧‧‧ first side

S2‧‧‧ second side

S3‧‧‧ third side

S4‧‧‧ fourth side

T‧‧‧ thickness

‧‧‧‧ angle

Claims (15)

A head mounted display device includes: a first light guide plate having a first surface and a second surface opposite to the first surface; a first micro display facing the first surface and disposed on the first surface a first end of the light guide plate; a first mirror disposed in the first light guide plate and located at the first end, the first mirror has a first reflective surface, the first reflective surface facing the first a light guide plate opposite to a second end of the first end and at an angle to the first surface; a first lens group disposed between the first light guide plate and the first micro display; and a plurality of a first microstructure is disposed on the first surface, wherein an angle between the first reflective surface and the first surface is α, a thickness of the first light guide plate is T, and a length of the first light guide plate is L, where The head mounted display device of claim 1, wherein the first microdisplay is a visible light microdisplay. The head-mounted display device of claim 1, wherein the first light guide plate further has a third surface and a fourth surface connected between the first surface and the second surface, and each The shape of the first microstructure separated by a plane perpendicular to the first surface and perpendicular to the third surface is a quadrilateral, and the quadrilateral includes a first side, a second side, a third side, and a a fourth side, the first side and the third side are opposite to each other, the second side and the fourth side are opposite to each other and are respectively connected between the first side and the third side, wherein the first side and the first side The first side is joined. The head-mounted display device of claim 3, wherein the first side, the second side, and the third side are each X in length, and the fourth side has a length of 2X, wherein 10 μm≦ X ≦ 500 μm. The head-mounted display device of claim 3, wherein the angle between the third side and the fourth side is 90°-α, and the angle between the first side and the fourth side is It is 90°+α. The head-mounted display device of claim 5, wherein an angle between the first side and the second side and an angle between the second side and the third side are 90 degrees. The head-mounted display device of claim 5, wherein the angle between the first side and the second side is 90°+α, and the angle between the second side and the third side is It is 90°-α. A head-mounted display device according to claim 1, wherein α is 30°. The head-mounted display device of claim 1, wherein the first microstructures have a refractive index equal to a refractive index of the first light guide plate. The head mounted display device of claim 1, further comprising: a fixing device, the first light guide plate, the first micro display, the first mirror, the first lens group, and the The first microstructures are disposed adjacent to a first eye of a user. The head-mounted display device of claim 1, further comprising: a second micro-display facing the first surface and disposed at the second end; a second mirror disposed in the first light guide plate and located at the second end, the second mirror having a second reflective surface, the second reflective surface facing the first end, and the first The face clip is at an angle; and a second lens group is disposed between the first light guide plate and the second micro display. The head mounted display device of claim 11, wherein one of the first microdisplay and the second microdisplay is a visible light microdisplay and the other is an infrared microdisplay. The head-mounted display device of claim 1, further comprising: a second light guide plate having a fifth surface and a sixth surface opposite to the fifth surface; a second micro display facing the a fifth surface disposed at a third end of the second light guide plate; a second mirror disposed in the second light guide plate and located at the third end, the second mirror having a second reflection And the second reflective surface faces a fourth end of the second light guide plate opposite to the third end, and is at an angle with the fifth surface; a second lens group is disposed on the second light guide plate and the second light guide plate Between the second microdisplays; and a plurality of second microstructures disposed on the fifth side. The head mounted display device of claim 13, further comprising: a fixing device to the first light guide plate, the first micro display, the first mirror, the first lens group, and the The first microstructures are disposed adjacent to a first eye of a user, and the second light guide plate, the second micro display, the second The mirror, the second lens group and the second microstructures are disposed adjacent to a second eye of the user. The head-mounted display device of claim 14, wherein the first micro-display and the second micro-display are visible light micro-displays, and the image beam output by the first micro-display and the second micro-display The output image beam has a parallax.